享元模式

1.说明：

namespace FlyweightPattern
{

    /*
     * 享元模式：实际来看，享元模式其实是为了避免创建过多的数据对象。
     * 比如此列：在象棋中只有红黑双方，红棋子只是红棋中的一颗，很多
     * 红棋其实可以使用一个红棋对象表示即可，在外部只需公开该棋的状
     * 态即可区分那个红棋，从而达到减少内存消耗的目的
     */

    /// <summary>
    /// 一个表示象棋的接口
    /// </summary>
    public interface IChess
    {
        void Move(Pieces pieces);//移动棋子
    }

    /// <summary>
    /// 具体的棋子的移动方式
    /// </summary>
    public class Pieces
    {
        public string Action;//棋子的移动方式
        public Pieces(string action)
        {
            this.Action = action;
        }
    }

    /// <summary>
    /// 具体的棋子
    /// </summary>
    public class Chess : IChess
    {
        private string Name;

        public Chess(string name)
        {
            this.Name = name;
        }

        #region IChess 成员

        public void Move(Pieces pieces)
        {
            Console.WriteLine("{0} {1}", Name, pieces.Action);
        }

        #endregion
    }

    public class ChessFactory
    {
        private Hashtable Chesss = new Hashtable();

        /// <summary>
        /// 象棋的颜色
        /// </summary>
        /// <param name="key"></param>
        /// <returns></returns>
        public Chess GetChess(string key)
        {
            if (!Chesss.ContainsKey(key))
                Chesss.Add(key,new Chess(key));

            return (Chess)Chesss[key];
        }

        /// <summary>
        /// 返回棋子的种类
        /// </summary>
        /// <returns></returns>
        public int GetChessCount()
        {
            return Chesss.Count;
        }
    }
}
2.调用

       static void Main(string[] args)
        {
            //生产棋子的工厂
            ChessFactory cf = new ChessFactory();
            Chess c1 = cf.GetChess("红棋");
            c1.Move(new Pieces("出马"));
            Chess c4 = cf.GetChess("黑棋");
            c4.Move(new Pieces("出马"));
            Chess c2 = cf.GetChess("红棋");
            c2.Move(new Pieces("出车"));
            Chess c5 = cf.GetChess("黑棋");
            c5.Move(new Pieces("出马"));
            Chess c3 = cf.GetChess("红棋");
            c3.Move(new Pieces("出炮"));
            Chess c6 = cf.GetChess("黄棋");
            c6.Move(new Pieces("认输"));

            Console.WriteLine("棋子的种类数：{0}",cf.GetChessCount());
            Console.ReadKey();
        }